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um/Stop conflating task_struct::stack with thread_info 

thread_info may move in the future, so use the accessors.

[ Andy Lutomirski wrote this changelog message and changed
  "task_thread_info(child)->cpu" to "task_cpu(child)". ]

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jann Horn <jann@thejh.net>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/3439705d9838940cc82733a7335fa8c654c37db8.1473801993.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Linus Torvalds 2016-09-13 14:29:23 -07:00 committed by Ingo Molnar
parent 97245d0058
commit d896fa20a7
1 changed files with 4 additions and 4 deletions
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8
arch/x86/um/ptrace_32.c
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@ -194,7 +194,7 @@ int peek_user(struct task_struct *child, long addr, long data)
static int get_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
{
int err, n, cpu = ((struct thread_info *) child->stack)->cpu;
int err, n, cpu = task_cpu(child);
struct user_i387_struct fpregs;
err = save_i387_registers(userspace_pid[cpu],
@ -211,7 +211,7 @@ static int get_fpregs(struct user_i387_struct __user *buf, struct task_struct *c
static int set_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
{
int n, cpu = ((struct thread_info *) child->stack)->cpu;
int n, cpu = task_cpu(child);
struct user_i387_struct fpregs;
n = copy_from_user(&fpregs, buf, sizeof(fpregs));
@ -224,7 +224,7 @@ static int set_fpregs(struct user_i387_struct __user *buf, struct task_struct *c
static int get_fpxregs(struct user_fxsr_struct __user *buf, struct task_struct *child)
{
int err, n, cpu = ((struct thread_info *) child->stack)->cpu;
int err, n, cpu = task_cpu(child);
struct user_fxsr_struct fpregs;
err = save_fpx_registers(userspace_pid[cpu], (unsigned long *) &fpregs);
@ -240,7 +240,7 @@ static int get_fpxregs(struct user_fxsr_struct __user *buf, struct task_struct *
static int set_fpxregs(struct user_fxsr_struct __user *buf, struct task_struct *child)
{
int n, cpu = ((struct thread_info *) child->stack)->cpu;
int n, cpu = task_cpu(child);
struct user_fxsr_struct fpregs;
n = copy_from_user(&fpregs, buf, sizeof(fpregs));